the last equilibrium gravity question I need help with

Two masses of 1kg each are connected by a light, inextensible string of one metre in length. The two masses are now made to approach a Black Hole of mass 7.45×1030 kg such that the string connecting them lies along a radius. What is the tension in the string when the nearest mass is a distance of 625 km from the Black hole?
[G=6.673×10-11 m3kg-1s-2]